WordWeb Online

1. Lose validity
   "My passports expired last month";
   - run out
    
2. Pass from physical life and lose all bodily attributes and functions necessary to sustain life
   - die, decease, perish, go, exit, pass away, pass, kick the bucket, cash in one's chips, buy the farm [N. Amer], conk, give-up the ghost, drop dead, pop off, choke, croak, snuff it, pop one's clogs
    
3. Expel air
   "expire when you lift the weight";
   - exhale, breathe out

Derived forms: expired, expires, expiring

Type of: breathe, change state, discontinue, respire, suspire, take a breath, turn